Balser and Tom well knew that Jim’s prophecy might easily come true, but they had faith in the watchfulness of their sentinels, Tige and Prince, and the moon being at its full, they hoped rather than feared that his bearship might return, and were confident that, in case he did, his danger would be greater than theirs. After the castle floor had been carefully swept, the boys carried in the deerskins and spread them on the ground for a carpet. The bearskins were then taken in, and the beds were made; traps, guns, and provisions were stored away, and the sleds were drawn around to one side of the door, and placed leaning against the tree. The boys were hungry, and Jim insisted that supper should be prepared at once; but Tom, having made several trips around the tree, remarked mysteriously that he had a plan of his own. He said there was a great deal of work to be done before sundown, and that supper could be eaten after dark when they could not work. Tom was right, for the night gave promise of bitter cold. Limpy did not tell his plans at once, but soon they were developed. The hollow in the tree in which the boys had made their home was almost circular in form. It was at least ten or eleven feet in diameter, and extended up into the tree twenty or thirty feet. Springing from the same root, and a part of the parent tree, grew two large sprouts or branches, which at a little distance looked like separate trees. They were, however, each connected with the larger tree, and the three formed one. “What on earth are you pounding at that tree for?” asked Jim, while Tom was striking one of the smaller trees with the butt end of the hatchet, and listening intently as if he expected to hear a response. Tom did not reply to Jim, but in a moment entered the main tree with axe in hand, and soon Balser and Jim heard him chopping. The two boys at once followed Tom, to learn what their eccentric companion was doing. Tom did not respond to their questions, but after he had chopped vigorously for a few minutes the result of his work gave them an answer, for he soon cut an opening into the smaller tree, which was also hollow. Tom had discovered the hollow by striking the tree with his hatchet. In fact, Tom was a genius after his own peculiar pattern. The newly discovered hollow proved to be three or four feet in diameter, and, like that in the larger tree, extended to a considerable height. After Tom had made the opening between the trees, he sat upon the ground, and with his hatchet hewed it to an oval shape, two feet high and two feet broad.